Abstract
A theory for studying the damping of elastic waves in body centered cubic crystals is evolved in the high temperature region in the absence of magnetic field starting from nearest neighbour distance and hardness parameter and using electrostatic and Born-Mayer potentials. The theory is tested for cesium halides viz. CsCl, CsBr and Csl from 50 to 500 K. It is obsdrved that a sharp change in damping occurs if the temperature is elevated and is high at 300 K The phonon viscosity and thermoelastic losses are accounted for acoutic waves along and directions for different orientations. Some peculiar properties are also seen in these substances. It is concluded that damping of elastic waves is one of the characteristic properties of the substances.
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